Javascript 如何在谷歌云上使用已安装的mongodb

我最近用nodejs开发了一个react应用程序，它的数据依赖于mongodb。我还刚刚在谷歌计算引擎上安装了mongodb，并打开了27017端口。但是，我的问题是，如何将我的应用程序（我使用的是Mongoose）连接到VM实例

以下是localhost（我的本地计算机）上的连接字符串，我应该将其更改为什么：

module.exports = {
    url: 'mongodb://localhost:27017/dapashirts'
}

这是我的server.js文件：

const express = require('express');
const bodyParser = require('body-parser');
const cors = require("cors");

const app = express();

app.use(cors());
app.use(bodyParser.urlencoded({extended:true}));
app.use(bodyParser.json());

// Configuring the database
const dbConfig = require('./config/database.config.js');
const mongoose = require('mongoose');

mongoose.Promise = global.Promise;

// Connecting to the database
mongoose.connect(dbConfig.url, {
    useNewUrlParser: true, useUnifiedTopology: true, useCreateIndex: true
}).then(() => {
    console.log("Successfully connected to the database");    
}).catch(err => {
    console.log('Could not connect to the database. Exiting now...', err);
    process.exit();
});

// Require routes
require('./routes/department.routes.js')(app);
require('./routes/category.routes.js')(app);
require('./routes/product.routes.js')(app);
require('./routes/order.routes.js')(app);

app.listen(3500, () => {
    console.log("Server is listening on port 3500");
});

以下是一个示例模型：

const mongoose = require('mongoose');

const ProductSchema = mongoose.Schema({
    category_id: {
            type: [mongoose.Schema.Types.ObjectId],
            required: true
        },
    name: {
            type: String,
            required: true,
            unique: true
        },
    description: {
            type: String,
            required: true
        },
    price: {
            type: Number,
            required: true
        },
    discounted_price: {type: Number, default: 0.00},
    image: String,
    image_2: String,
    thumbnail: String,
    display: { type: Number, min: 0, max: 3, default: 0 }
});

module.exports = mongoose.model('Product', ProductSchema);

以下是一条示例路线：

module.exports = (app) => {
    const products = require('../controllers/product.controllers.js');

    // Create a new product
    app.post('/products', products.create);

    // Retrieve all products
    app.get('/products', products.findAll);

    // Retrieve a single product with productId
    app.get('/products/:productId', products.findOne);

    // Retrieve a products with categoryId
    app.get('/products/:categoryId', products.findWithCategoryId);

    // Update a product with productId
    app.put('/products/:productId', products.update);

    // Delete a produt with productId
    app.delete('/products/:productId', products.delete);
}

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